S60程序中，如何在指示器面板中绘制图标

这片文章介绍一种在S60指示器面板中绘制图标的方法。你可以放一个图标在电池面板或信号面板旁，你需要自定义代码。

我用了一个派生自CCoeControl的CIndicatorIcon 类。在ConstructL()中写如下代码：

CODE:

void CIndicatorIcon::ConstructL()
      {
      iMyWindowGroup = RWindowGroup(iCoeEnv->WsSession());
      User::LeaveIfError(iMyWindowGroup.Construct((TUint32)&iMyWindowGroup));

      iMyWindowGroup.SetOrdinalPosition(0, ECoeWinPriorityAlwaysAtFront);
      iMyWindowGroup.EnableReceiptOfFocus(EFalse);

      CreateWindowL(&iMyWindowGroup);

      // by default setting the indicator icon to inactive
      SetIndicatorIconL(EIndicatorIconAppActive);

      ActivateL();
      }

在ConstructL()函数中，代哦用了SetIndicatorIconL()，来设置图标：

CODE:

void CIndicatorIcon::SetIndicatorIconL(TIndicatorIcon aIndicatorIconType, TBool aRedraw)
      {
      switch(aIndicatorIconType)
            {
            case EIndicatorIconEmpty:
                     iIndicator = CEikonEnv::Static()->CreateBitmapL(KSysIconFile, EMbmAvkonQgn_prop_empty);
                     iIndicatorMask = CEikonEnv::Static()->CreateBitmapL(KSysIconFile, EMbmAvkonQgn_prop_empty_mask);
                     break;

            case EIndicatorIconAppActive:
                     iIndicator = CEikonEnv::Static()->CreateBitmapL(KSysIconFile, EMbmAvkonQgn_bt_connect_on);
                     iIndicatorMask = CEikonEnv::Static()->CreateBitmapL(KSysIconFile, EMbmAvkonQgn_bt_connect_on_mask);
                     break;

            case EIndicatorIconAppInactive:
                     iIndicator = CEikonEnv::Static()->CreateBitmapL(KSysIconFile, EMbmAvkonQgn_prop_bt_audio);
                     iIndicatorMask = CEikonEnv::Static()->CreateBitmapL(KSysIconFile, EMbmAvkonQgn_prop_bt_audio_mask);
                     break;

            default:
                     break;
            }

      SetRect(TRect(TPoint(KIndicatorPosX, KIndicatorPosY),iIndicator->SizeInPixels()));

      // if aRedraw == ETrue just draw the canvas again.
      if(aRedraw)
            {
            DrawNow();
            }
      }

你必须重载CCoeControl类中的Draw()函数. 该函数如下：

CODE:

void CIndicatorIcon::Draw(const TRect& aRect) const
      {
      CWindowGc& gc = SystemGc();

      gc.Clear();
      gc.SetBrushStyle(CGraphicsContext::ENullBrush);
      gc.BitBltMasked(TPoint(aRect.iTl.iX, aRect.iTl.iY),
            iIndicator,
            TRect(TPoint(0, 0), iIndicator->SizeInPixels()),
            iIndicatorMask,
            ETrue);
      }

添加以下代码到你的AppUi类下的ConstructL()函数中：

CODE:

      iIndicatorIcon = CIndicatorIcon::NewL();
      // The next line will set the icon to draw and it'll draw to the screen.
      iIndicatorIcon->SetIndicatorIconL(CIndicatorIcon::EIndicatorIconAppInactive, ETrue);

程序运行后你将看到如下的界面：

当程序运行在后台

当出现任务菜单时

译文地址：http://www.symbianx.cn/viewthread.php?tid=51&extra=page%3D1

下载：程序源码

Symbian OS Internals——Symbian OS模拟器
在Symbian程序中使用汇编代码
S60系列用户界面显示器规范
如何从Carbide.c++产生SIS安装文件？
Symbian系统中DLL的冻结
CCoeControl类中Draw()函数的调试
移动代码签名 (ACS) 常见问题问答
DSA and RBackupWindow